Apple isn't saying a word about it and its late CEO Steve Jobs once said no one would buy a big phone. But, that was before Apple had a deal with China Mobile and its 767 million subscribers. In China, smartphones often double as tablets given the high cost of both relative to the country's average salary.

Steve Cortes, founder of Veracruz TJM, thinks a large screen iPhone is just one of many reasons to buy Apple's stock.

"In this case, I think size matters," says Cortes on CNBC's Street Signs' Talking Numbers segment. "Apple has its own version of the 'Rocky' movie franchise; there are so many sequels now. But, I think that the iPhone 6 will be the most significant because of the size issue."

Outside of a potentially larger-screened iPhone – and though he believes Apple's rapid growth days are behind it – Cortes thinks the company's financials are a reason to own the company's shares.

"It is still a cash-generating machine," says Cortes. "You only pay 11 times next year's earnings and you get the kicker of a dividend yield of 2.3%. So, I am a big fan of Apple."

However, John Kosar, Director of Research of Asbury Research, is not as optimistic for the time being. "I'm not so sure I want to jump into the pool right now," says Kosar. "The stock is overbought on a monthly basis."

Kosar is paying attention to the stock's 200-day moving average, currently at $502.

"My inclination is to wait a few weeks. Wait for a pullback towards $500 – you have some major support there around $502 – and then watch for that stock to get a little traction again and then enter. I think larger picture, we take a run at those highs at $583 to $595."

To see the full discussion on Apple with Cortes on the fundamentals and Kosar on the technicals, watch the video above.